Screen background is darker pixels alot of red or pink

Hello,everyone,yestoday I installed the knoppix in my usb-hdd,all is great,but when I boot it,somthing happened, now I described it .
It's a mostly white background, but the top 150~ pixels or so, is a black background, with white pink and other colors scattered loosely, the white background is darker pixels alot of red or pink, tightly knit, and the mouse cursor is a white moving block of about 120 pixels with black scattered about, and I get initiating startup sequence. so what do I do? If anyone can help please and thank you. Thanks all for reading.

note:My computer is ASUS notebook,and my graphics card is ATI Mobility Radeon HD 3470

Help me please!thanks..